Polymer electrolyte for lithium battery and lithium battery including the polymer electrolyte

Patent metadata

Field	Value
Publication number	US-9634355-B2
Application number	US-201514718490-A
Country	US
Kind code	B2
Filing date	May 21, 2015
Priority date	Aug 25, 2014
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A polymer electrolyte for a lithium battery, the polymer electrolyte comprising a compound represented by Formula 1:

wherein, in Formula 1, X 1 to X 6 , Ar 1 , Ar 2 , R 1 , R 2 , m, and n are the same as defined in the detailed description of the present specification.

First claim

What is claimed is:

1. A polymer electrolyte for a lithium battery, the polymer electrolyte comprising a compound represented by Formula 1:

wherein, in Formula 1,
X 1 , X 2 , X 3 , X 4 , X 5 , and X 6 are each independently —SO 2 — or —O—,
Ar 1 and Ar 2 are each independently a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group,
at least one selected from R 1 and R 2 is a lithium ion conductive group, provided that when only one selected from R 1 and R 2 is a lithium ion conductive group, the other one selected from R 1 and R 2 is a hydrogen atom,
0≦m≦1, 0≦n≦1, and m+n=1, and
a weight average molecular weight of the compound represented by Formula 1 is in a range of about 500 grams per mole to about 1,000,000 grams per mole.

2. The polymer electrolyte of claim 1 , wherein the lithium ion conductive group is at least one selected from Formulae 2 to 6:
—(R 3 ) a —SO 3 Li  Formula 2

—(R 4 ) b —SO 2 —NLi 2   Formula 3

—(R 5 ) c —SO 2 —N(Li)—SO 2 —R 9   Formula 4

—(R 6 ) d —SO 2 —(R 7 ) e —COOLi  Formula 5

—(R 8 ) f —COOLi  Formula 6

wherein, in Formulae 2 to 6,
R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 are each independently a single bond, a substituted or unsubstituted C1-C10 alkylene group, a substituted or unsubstituted C6-C20 arylene group, or a substituted or unsubstituted C3-C20 heteroarylene group,
R 9 is a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C6-C20 aryl group, or a substituted or unsubstituted C3-C20 heteroaryl group, and
a, b, c, d, e, and f are each 0 or 1.

3. The polymer electrolyte of claim 2 , wherein at least one hydrogen in each of R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 is substituted with a substituted or unsubstituted C1-C20 alkyl group substituted with a nitro group, a cyano group, a carboxylic acid group or its salt, or a sulfonamide group, or a halogen, and at least one hydrogen in R 9 is substituted with a halogen.

4. The polymer electrolyte of claim 1 , wherein the lithium ion conductive group is selected from —SO 3 Li, —COOLi, —SO 2 N(Li)SO 2 CF 3 , —SO 2 N(Li)SO 2 CF 2 CF 3 , —SO 2 C 6 H 4 COOLi, —C 6 H 3 (SO 2 NH 2 )COOLi, —CH(COOLi)CH 2 COOLi, —C 6 H 3 (OH)COOLi, —C 6 H 2 (NO 2 ) 2 COOLi, and —CH 2 C(CH 3 ) 2 COOLi.

5. The polymer electrolyte of claim 1 , wherein Ar 1 and Ar 2 are each independently selected from:

6. The polymer electrolyte of claim 1 , wherein the polymer electrolyte is represented by Formula 7:

wherein, in Formula 7,
Ar 1 , Ar 2 , R 1 , R 2 , m, and n are as defined in connection with Formula 1.

7. The polymer electrolyte of claim 6 , wherein the polymer electrolyte is represented by Formula 8:

wherein, in Formula 8,
m and n are as defined in connection with Formula 1.

8. The polymer electrolyte of claim 1 , wherein a ratio m:n is in a range of about 90:10 to about 50:50.

9. The polymer electrolyte of claim 1 , further comprising a lithium salt.

10. The polymer electrolyte of claim 9 , wherein the lithium salt comprises at least one selected from LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiN(SO 2 C 2 F 5 ) 2 , LiN(SO 2 F 2 ) 2 , Li(CF 3 SO 2 ) 2 N, LiC 4 F 9 SO 3 , LiClO 4 , LiAlO 2 , LiAlCl 4 , LiN(C x F 2x+1 SO 2 )(C y F 2y+1 SO 2 ) (wherein, x and y are each independently a natural number), LiF, LiBr, LiCl, LiI, and LiB(C 2 O 4 ) 2 (lithium bis(oxalato)borate).

11. The polymer electrolyte of claim 9 , wherein the lithium salt comprises a lithium sulfonimide compound.

12. The polymer electrolyte of claim 11 , wherein the lithium sulfonimide compound comprises at least one selected from Li(FSO 2 ) 2 N, Li(CF 3 SO 2 ) 2 N, Li(C 2 F 5 SO 2 ) 2 N, LiN(C p F 2p+1 SO 2 )(C q F 2q+1 SO 2 ) (wherein, p and q are different from each other, and p and q are each independently an integer from 1 to 20), LiN((SO 2 ) 2 C p F 2p ) (wherein, p is an integer from 1 to 10), Li(C 6 F 5 SO 2 ) 2 N, Li(C 10 F 7 SO 2 ) 2 N, Li(C 6 F 5 SO 2 )(C 10 F 7 SO 2 )N, LiN(C 6 F 5 SO 2 )(C p F 2p+1 SO 2 ) (wherein, p is an integer from 1 to 10), and LiN(C 10 F 7 SO 2 )(C p F 2p+1 SO 2 ) (wherein, p is an integer from 1 to 10).

13. The polymer electrolyte of claim 1 , further comprising an ionic liquid.

14. The polymer electrolyte of claim 13 , wherein the ionic liquid comprises at least one selected from diethylmethylammonium trifluoromethanesulfonate, dimethylpropylammonium trifluoromethanesulfonate, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide, N-methyl-N-propylpiperidinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl)imide, and methyl propylpiperidinium trifluoromethanesulfonylimide.

15. A lithium battery comprising:
a positive electrode;
a negative electrode; and
the polymer electrolyte of claim 1 disposed between and in contact with the positive electrode and the negative electrode.

16. The lithium battery of claim 15 , wherein the lithium battery is a lithium air battery or a lithium secondary battery.

17. A binder for a lithium battery, wherein the binder comprises the polymer electrolyte of claim 1 .

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Kihyun
• Lee Dongjoon
• Kwon Hyukjae
• Kim Taeyoung
• Im Dongmin

Classifications

• H01M12/08

  composed of a half-cell of a fuel-cell type and a half-cell of the secondary-cell type · CPC title

• Y02E60/128

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• H01M4/622

  being polymers · CPC title

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title